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Old 8th April 2004, 03:14 AM   #1
Rocky is offline Rocky  Norway
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Question Will Raven R1 survive my crossover?

One simple question:

Raven R1, actively crossed at 2179Hz with 4th order LR.. Will it survive?

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Old 8th April 2004, 03:50 AM   #2
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2179Hz is too low. Move it up to 2180 and you'll be OK.
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Old 8th April 2004, 03:54 AM   #3
Rocky is offline Rocky  Norway
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Hahah.. seriously... say 2150-2200

1000Hz*2^x=4750Hz
2^x=4,75
log(2^x)=log(4,75)
x*log 2=log 4,75
x=log 4,75/log 2
x=2,247927513 octaves
my_ideal_XO_point=1000*2^(x/2)=2179Hz
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Old 8th April 2004, 03:57 AM   #4
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If you push it too hard, it will not survive.

I was using 3rd order at 3k5 and had t replace ribbon occasionally. Now I'm using it with first order at 12K and it seems fine.
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Old 8th April 2004, 04:05 AM   #5
Rocky is offline Rocky  Norway
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3rd order at 3k5 and problems... Sheize.. Gotta do some math

You wouldn't happen to know where the "critical spot" is, Peter? I mean..: am I looking for respone on 1,25kHz... 1kHz...?
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Old 8th April 2004, 05:12 AM   #6
Rocky is offline Rocky  Norway
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Quote:
Originally posted by Peter Daniel
If you push it too hard, it will not survive.

I was using 3rd order at 3k5 and had t replace ribbon occasionally.
Peter,

The octaves between our XO points are:
2200Hz*2^x=3500Hz
2^x=(3500Hz/2200Hz)
log(2^x)=log(3500Hz/2200Hz)
x*log 2=log (3500Hz/2200Hz)
x=log (3500Hz/2200Hz)/log 2
x=0,67 octaves

by means your problematic 18dB/oct XO should be 18dB*0,67oct=12,06dB down when my 24dB/oct XO kicks in..

my XO will from this point get down 6dB/oct faster than yours, so it will take my filter 12,06dB/6dBoct=2.01oct to come correct with your response, right?

Since I'm at 2200Hz, that means my response meets yours at frequency X, when X*2^2,01=2200Hz.
X=2200Hz/2^2,01=546,2Hz

Now,

Looking at Raven R1s response graph, it seems to be down 12dB or so at this point (hard to get exact, there is shitty resolution in the datasheet) so if I add my 24dB/oct rolloff to the natural rolloff, I get that the Raven R1 is down 2,01 oct*24 dB/oct + 12dB = 60dB at this point.

Conclusion being; It is less likely that your Raven R1 got fried 60dB down, at 546,2Hz. It most likely happened at a higher SPL and frequency, so I will have even greater chance of frying my Raven with the filter I was concidering.

Thanks.
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Old 8th April 2004, 05:46 AM   #7
Rocky is offline Rocky  Norway
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Not taking natural rolloff into concideration (to keep things mathematically correct) I see that your 1st order at 12kHz is -26.74dB@546,2Hz, versus my 4th order (and your 3rd order) -48,24dB@546,2Hz. This tells us for sure that the problems you experienced was far longer up than 546Hz, or they would have been even greater with your 12kHz 1st order setup...
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